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1. (WO1997037339) VIRTUAL RETINAL DISPLAY WITH EXPANDED EXIT PUPIL

Pub. No.:    WO/1997/037339    International Application No.:    PCT/US1997/003302
Publication Date: Fri Oct 10 01:59:59 CEST 1997 International Filing Date: Fri Feb 28 00:59:59 CET 1997
IPC: G02B 27/00
G02B 27/01
Applicants: UNIVERSITY OF WASHINGTON
Inventors: KOLLIN, Joel, S.
JOHNSTON, Richard, S.
MELVILLE, Charles, D.
Title: VIRTUAL RETINAL DISPLAY WITH EXPANDED EXIT PUPIL
Abstract:
A display device (10) is achieved using an optical system which generates an expanded exit pupil (21) without compromising magnification or resolution. Modulated light from a source (12) is converged toward a focal point by an optics subsystem (14). A scanning subsystem (16) deflects the converging light, and thus the focal point, along a raster pattern to define a curved intermediate image plane (15). An exit pupil expanding apparatus (18) defines a curved surface which coincides with the curved image plane (15). Impinging light rays at a given instant in time span a given incidence angle (υi). Exiting light rays span a larger angle (υo). The exiting light spans a larger surface area of an ensuing eyepiece (20). In turn an expanded exit pupil (21) occurs beyond the eyepiece. Exit pupil expanding embodiments include a curved diffractive optical element (300), fiber optic face plate (320), lens array (340) and diffuser (360). The diffractive optical element generates multiple exit pupils (304-316), while the other embodiments generate enlarged exit pupils.